“Nectariferous and Melliferous Properties of Species in the Genus Nepeta L. In Forest-Steppe Zone of Ukraine and Recommended Procedure for Determination of Relevant Indexes”. CHORNOMORSKI BOTANICAL JOURNAL, vol. 6, no. 1, July 2010, pp. 84-88, https://cbj.kspu.edu/index.php/cbj/article/view/587.